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This study describes a discharge flow characteristic of a roller tube pump when an operating condition of the pump is changed and a compression cycle of a tube becomes different. A roller tube pump is one of a fluid transport system which can generate a fluid flow by compressing tube by a roller and a plunger. Tube pumps have following advantages: The roller which moves fluid in the tube does not touch the fluid directly. The number of components is small and downsizing of the pump may be achieved. A power consumption is small. Therefore, the roller tube pump is used for chemical analysis processes and an infusion system. In the recent years, a novel infusion pump is urgently needed to prepare for the future sudden disaster. The novel pump should be available for use in the following situations: emergency medical situations which an emergency treatment of a hypovolemic shock caused by a trauma is needed, disaster situations which there is not enough space around victims which general infusion bags cannot be hung and a long transport of patients is assumed. There is a possibility that the novel pump can be developed based on a roller tube pump due to the above advantages. However, due to the operating principle of the tube pump, the discharge flow becomes pulsation flow according to a compression cycle of a tube by rollers. In order to use the pump regardless of the surrounding condition, the novel pump has to supply the constant flow rate regardless of a height of the infusion bag. This study aims to investigate a relationship among the discharge flow condition, the surrounding condition of the pump and the tube compression in order to optimize the pump structure to develop the novel tube pump system. In this report, we especially focused on the effects of a height of an infusion bag, which simulates infusion bags and a compression cycle of the tube by a roller on the discharge flow characteristic. We obtained following information experimentally: discharge flow rate is affected by a potential of water head when the number of the roller is small. When the number of the roller becomes large and the tube is enough compressed, the supply flow rate becomes stable. However, when the number of the roller increases, a net supply flow rate becomes small.

510 Basic study on discharge flow characteristics of roller tube pump